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CVE-2021-3803— Inefficient Regular Expression Complexity in fb55/nth-check

Quick assessment

Affected
fb55 fb55/nth-check
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nth-Check是用于将 CSS nth-checks 解析并编译为高度优化的函数。 nth-check 存在安全漏洞，该漏洞源于易受低效正则表达式复杂性的影响。

AI Predicted 5.3 Difficulty: Easy EPSS 2.17% · P81

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-3803

Vulnerability Information
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Vulnerability Title
Inefficient Regular Expression Complexity in fb55/nth-check
Source: CVE Program / CVE List V5
Vulnerability Description
nth-check is vulnerable to Inefficient Regular Expression Complexity
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
nth-check 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nth-Check是用于将 CSS nth-checks 解析并编译为高度优化的函数。 nth-check 存在安全漏洞，该漏洞源于易受低效正则表达式复杂性的影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fb55 fb55/nth-check unspecified ~ 2.0.1 -

II. Public POCs for CVE-2021-3803

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-3803

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Patches & Fixes for CVE-2021-3803 (1)

Vendor Advisories for CVE-2021-3803 (1)

Mailing List Discussions for CVE-2021-3803 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1333

V. Comments for CVE-2021-3803

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